AJAX post returning 500 Internal Server Error on Live Server

I created a script where a user can select from a variety of

shipping options for an order from within a jQuery dialog box. The

shipping rates are delivered via UPS & FedEx. Oddly enough, the

script works fine on my development machine, but on the live server,

Firebug returns a "500 Internal Server Error"

Here is what my jQuery looks like:

jQuery("#select-shipping").click(function(){
// Open the dialog, start with the "loading page"


$("#shipping-select").load('func/shipping_load.php').dialog({
bgiframe: true,
autoOpen: true,
position: 'center',
title: 'Select Shipping Method',
width: 400,
height: 400,
modal: true,
buttons: {
'Apply Shipping': function() {
var bValid = true;

if (bValid) {
var fship =

$('input[name=shipping]:checked').val();
var arr =

fship.split('-');
var shipPrice =

arr[1];
var shipMeth =

arr[0];

var subOrder =

$("#d_total").val();
if

($('#customer-discount').val() != 'false') {
var minDis =

subOrder * ("."+$("#customer-discount").val());
var nTotal =

subOrder - minDis;

var orderTotal

= nTotal + parseFloat(shipPrice) + parseFloat($("#tax").val()); /*

Order Total minus customer discount */



$("#order_discount_amount").val("-"+minDis.toFixed(2));
}
else {
var orderTotal

= parseFloat(subOrder) + parseFloat(shipPrice) +

parseFloat($("#tax").val()); /* Order Total, No Discount */
}


$("#order_total").val(orderTotal.toFixed(2)),


$("#shipcost").val(parseFloat(shipPrice)),


$("#shipping_method").html(shipMeth);



$(this).dialog("destroy");
}
},
'Close Window': function() {
$(this).dialog("destroy");

}
},
close: function() {
$(this).dialog("destroy");
}
});

// This portion actually runs the PHP code to get the

rate results from UPS & FedEx
$.ajax({
type: "POST",
url: "func/shipping_selection.php",
data: "shipid=" + $("#customer-ship-id").val()

+ "&cartid=" + $("#cart_id").val(),
success: function(html){
$('#sLoader').fadeOut("fast");
$("#sLookup").html(html);
}
});

});


The dialog opens a loader page (with gif) and that portion works fine.

Once the AJAX post is complete (shipping_selection.php), it is

supposed to update the "sLookup" div with the HTML from the

shipping_selection.php page. Like I said, it works perfectly on my

testing server, but fails on the live server. Both are running PHP

5.2xxxx.

Also, notice in the attached images that the 'shipping_selection.php'

is actually working...rate results are returned from both UPS and

FedEx, however something is failing on the AJAX success function.

 

Is there any .cgi files involved, did you CHMOD them 755 ?

 

and it's not because of ajax it's because of func/shipping_selection.php, it has a problem

 

This is the PHP section, and you have a PHP problem. You've posted the JavaScript code - we need the PHP code to find the problem.
JavaScript cannot cause an internal server error (500) as it's executed on the client side.

 

dont need to give execute rules under it.